屏東地區第一、二期作水稻之生態與收量之關係

Abstract

爲探討屏東地區第二期作水稻單位面積產量較第一期作低落之原因，乃以嘉南8號爲主比較其在同一栽培管理但不同地力情形下（包括增收競賽歷年獲勝水田及一般水田）之兩期作生育過程，部份水田並設氮肥用量及栽植密度試驗，以探討葉面積指數與乾物生產之關係，結果獲致數點結論如下： It is commonly acknowledged in Taiwan that the rice yield in the second crop is generally lower (15~20%) than that in the first crop. The trend is particularly significant in Pingtung area, the southernmost part of Taiwan (35%). By comparing the growth processes of Chianan 8 mainly under the two different crop seasons on a highly productive and a few normaly productive paddies in Pingtung, the following results were obtained.